High-forage, lactating cow rations are typically defined as those containing more than 55 percent forage in the total mixed ration (TMR) or more than 25 percent forage neutral detergent fibre on a dry matter (DM) basis.

It is common practice for today’s TMRs to contain two-thirds of their forage DM from corn silage, either BMR, conventional or a combination of the two types of hybrids.